Obviously don't read this if you haven't read Batman #13 and #14. Scott Snyder recently appeared on an episode of Kevin Smith's 'Fatman on Batman'. He talked about his life, what got him into Batman etc and was then asked what his favourite stories were (This is around the 1h 49min mark if you want to listen for yourself) and he mentioned Tower of Babel, and also that it influenced his Death of the Family arc. If you have read Tower of Babel then you'll know that Batman has collected files on how to defeat each member of the Justice League, and these are used against them. Well, at the end of Batman #14 Joker holds in his hands a black book written by Bruce and Joker says that in it is "The secret that let me learn it all". There have been theories about what this secret could be but with what Snyder said on the podcast I am now almost certain that it will be how to defeat the BatFamily or what their weaknesses are and Joker will then exploit these. I doubt that he will succeed in killing the entire Bat Family, but knowing that Bruce had collected these thought could definitely result in the death of the Bat Family. Anyway, let me know what you think of this and what your thoughts are.